The unlikely business pairing of Logan Paul and former Mr. Universe Arnold Schwarzenegger has resulted in a new slap fighting league that has pitted some of the world's strongest men and women against one other in a compelling display of personality and brute strength. With a structure that could easily be described as the UFC meets the World Arm Wrestling League, the new upstart has already provided fans of combat sports with some very captivating live moments, perhaps none more so than a knockout slap that was delivered at a pay-per-view event called PunchDown.

In a clip that went viral this week, a slap-fighter named Mad Max KO'd his opponent, Predator, with one hellacious slap in the first round. The challenger struck the champion so hard that when the camera cut to Logan Paul, who was on hand as a commentator, he just stared into the lense, speechless, with his eyes and mouth wide open.

Scroll up to watch the brutal KO of the former slap-fighting champion.